Answer Posted / rama krishna
Direct current or DC electric motors work for situations
where speed needs to be controlled. DC motors have a stable
and continuous current. DC motors were the first and
earliest motors used. They were found, however, to not be as
good at producing power over long lengths. Electric
companies found using DC motors to generate electric did not
work because the power was lost as the electric was
transmitted. Brush DC motors use rings that conduct the
current and form the magnetic drive that powers the rotor.
Brushless DC motors use a switch to produce the magnetic
drive that powers the rotor. Direct current motors are often
found in appliances around the home.
Alternating current or AC electric motors are used
differently based on what type of AC motor it is. Single
phase AC motors are known as general purpose motors. They
work well in many different situations. These AC motors work
great for systems that are hard to start because they need a
lot of power up front. Three phase, also called polyphase,
AC motors are usually found in industrial settings. These
motors also have high starting power built transmit lower
levels of overall power. AC power gets its name from the
fact that it alternates in power. The amount of power given
off by an AC motor is determined by the amount of power
needed to operate the system.
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